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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Contract revenues $ 260,410 $ 185,310 $ 500,638 $ 335,604
Contract costs 230,348 165,771 444,473 294,476
Gross profit 30,062 19,539 56,165 41,128
Selling, general and administrative expenses 14,515 13,698 30,433 27,651
Amortization of intangible assets 83 83 167 167
Gain on sale of property and equipment (193) (229) (320) (300)
Income from operations 15,657 5,987 25,885 13,610
Other income (expense)        
Interest income 1 14 1 43
Interest expense (204) (160) (386) (370)
Other, net (32) (10) (59) (32)
Income before provision for income taxes 15,422 5,831 25,441 13,251
Income tax expense 5,887 2,114 9,696 5,034
Net income $ 9,535 $ 3,717 $ 15,745 $ 8,217
Income per common share:        
-Basic (in dollars per share) $ 0.46 $ 0.19 $ 0.77 $ 0.41
-Diluted (in dollars per share) $ 0.45 $ 0.18 $ 0.74 $ 0.39
Weighted average number of common shares and potential common shares outstanding:        
-Basic (in shares) 20,338 20,059 20,319 20,021
-Diluted (in shares) 21,094 20,978 21,098 20,956